/*******************************************************************************
 * This file is part of blueprint4j www.blueprint4j.org.
 * 
 *     blueprint4j is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * 
 *     blueprint4j is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU Lesser General Public License for more details.
 * 
 *     You should have received a copy of the GNU Lesser General Public License
 *     along with blueprint4j. If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package blueprint4j.comm.io;

import blueprint4j.utils.*;

import java.io.*;
import java.util.Vector;

public class LineReaderFixedWidth extends LineReader {
	private int width = 0;
	private Vector store= new Vector();
	
	public LineReaderFixedWidth(LineReader reader,int width) {
		super(reader);
		this.width = width;
	}
	
	public LineReaderFixedWidth(InputStream stream,int width) {
		super(stream);
		this.width = width;
	}
	
	protected boolean available() throws IOException {
		return store.size() > 0 || availableInTopStream() > 0;
	}
	
	public byte[] readBytes() throws IOException,TimeoutException {
		if (store.size() > 0) {
			return (byte[]) store.remove(0);
		}
		byte data[] = read();
		if (data.length < width) {
			unread(data);
			markNoRead();
			return null;
		}
		for (int i = 0;i < data.length / width;i++) {
			store.add(ByteM.subbyte(data,i*width,(i+1)*width));
		};
		unread(data,(data.length/width)*width,data.length-(data.length/width)*width);
		return readBytes();
	}
}
